Process of manufacturing endless driving-belts.



T. SLOPER. PROCESS OF MANUFACTURING ENDLESS DRIVING BELTS.

I APPLICATION FILED MAR. ll, I918. 1,271,785. Patented July 9,1918.

'2 SHEETS-SHEET l.

SLOPER. PROCESS OF MANUFACTURING ENDLESS DRIVING BELTS.

APPLICATION FILED MAR. H, I918.

Patented July 9, 1918.

2 SH EETSSHEE'T 2.

Gil

. i \ii. will it S SLGYEER, UF'IBEVIZES, ENGLANFJ.

.NJSiE 3F ."iil'iFJlUFihGTURENG ENDLESS DRZVKNG-BELTS.

mum 5 I specification of Eetters Eetent. Pai gmfggfl July 9 9331,,

.eppiieation filed March 11,1918.

PMXEPSSQS Endless Drii ing-Belts. of wing is e specificetion.

This invention i.. for improvements in the process of n'mnufacturingendless drivinghelts and oligeot to provide simple means whereby anendless cord core for :ihelt can be built up with e. twist in it toprevent the separation of the strands which takes place when these areonly laid si .e-bysitle anc, the belt is used to run over a smell A Theprocess closer-cling to this invention consists i r the followingsteps:(&) winch ing a Sitzlfidbf cord in an spiral ess mandrel against aspiral which assist the operator in positionspirals of theoord on themandrel this winding at least twice ERIE-"1 the seconcl or other two oio tl after the predetermined has been completed,

s removing menelrel from 'he interior the windings. and stretching thebelt that strancls are all drawn without (6) surrounding the belt lifterhas been stretched with rubit her with or with el,

out other reinforcing or and (f) vulcenizing the gointed at one point,for

I e reduced one end and nmrlo to enter iesponcling orifice at the otherend, so when the winding is to he released from the mandrel it is onlynecessery to separate two encls, when the mandrel can he sligipe out.

As it gage for determining the length of the hell; and e gunieto theWll'iCllfig of the cord, a spiral winding of wire is convenientlypermanently seeureol around the man-- wintling; of the corcl is thisfined spiral of length of the cord for the "mined and is guided clreland the then ieiel close Wire; thus the v: Kl is while 1y laying itagainst the so on.

next turn is deten Serial No. 221.806.

In the accompanying drawings which illustrate one method of carrying outthis invention Figure l is an elevation of a portion 01 the mandrel uponwhich the endlessclrivingbelt is built up;

Fig. 2 shows the some portion of the mandrel with the endlessdriving-belt Wound in position upon it;

Fig. 3 illustratesthe method of removing the mandrel from the endlessdriving-belt;

Fig. 4; shows a portion of the endless driving-belt in the form. itassumes Lifter it has been removed from the mandrel and stretched;

Fig. 5 shows the niethocl of surrounding the belt with an outer windingof cord;

Fig. 6 is a section of the belt constructed accordin to Fig. 5 after ithas been fiat toned, and Fig. 7 showsthe same belt cased with rubber.

The same letters indicate the seniepsrts throughout the drawings.

The mandrel A, which may he of steel, is bent around to the form of aring and one end is pro 'l(l6(l with a forwardly-projecting pin A Fig.3, which enters a. corresponding socket A in the opposite end. so thatthe ends can be made to meet, as shown in Fig. 1, and are prevented bythe pin A from lateral displacement when so engaged. Secured around themandrel is e. wire A which is wound around it a continuous .spiral andmay be soldered or, otherwise secured thereto. The wire of course is li-,vicleci at the point of juncture of the two vFig. 1.

In building an endless driving-belt on this mandrel, the cord B may becarried by :1 bobbin C, and the firstwinding is laid be siole the spiralA so that the length of the cord in the first Winding is determined andeach turn of the spiral is positioned. The stzirting end is shown at theright of Fig. 2 and the winding is con inued as many times around themandrel as there are to be corcls in the finished belt. the secondwinding being; laid beside the one first laid, and the subsequentwinclin s eechlieside the one last leitl. i l hen e snliioient numbercords, hat is, turns of one eontii .ious coral, have heen thus leiclside-h /eide eronnd the men 1e starting end. the finishing or together,as shown in "being provided with a covering.

which constitute the only cord ends in the belt, are brought togetherand spliced in any desired manner.

The winding being now complete, the belt is removed by first pulling theends of the mandrel apart, as shown in Fig. 3,

,and then untwisting the belt from the mandrel by revolving it aroundone of the separated ends. The belt when first removed is in the form ofan open spiral, as indicated by the removed portion illustrated in'Fig.3, but when the whole belt is free it is stretched and the windings thencome close Fig. 4. The cord of which the belt is composed may be of anysuitable material and the twisted belt thus produced may constitute thefinished article, or the cords may be made to adhere together by anydesired treatment, with or without thelvghcile t 1e cords are rubberedsimilarly to the cords used for the well-known cord-tires, the belt maybe vulcanized, and before doin so it may be wrapped around with a reinorcing winding of cord D, as shown in Fig. 5, and finally covered withrubber, as shown at E in Fig. 7 and the whole vulcanized together. Whenthe cord is to be covered with the rubber E, it is found difficult toget into the usual plunger-mold if the cordportion is circular, and tomake it easier to handle in these well-known molds, it is preferablypassed between rolls before being covered with the rubber E so that itis brought to the cross-section indicated in Fig. 6. When so shaped, it,after being surrounded with rubber, can be easily dropped into theplunger-mold in which it is vulcanized, and the pressure of the moldthen brings it to the well-known ll-section indicated in Fig. 7.

It will be appreciated that without the use of any rubber orothercovering, or any impregnating material, the driving-belt constructed inthe form and suitable for various purposes. v

The advantages of my invention result from the provision of a method ofmaking endless driving belts from a single strand wound in a pluralityof spirals, whereby the length of the cord to each spiral, as well asthe position thereof, is determined, sothat all of the belts made on thesame mandrel and with the same number of coils will be of the samelength.

ings is always ppeeator, as contrasted wlth the automatic shown in Fig.4 is neat matically controlled by the machine, and a such as I providewould be superfiuous. In winding my belt, the cord is wound on themandrel A by hand, or by manually controlled mechanism in such a mannerthat the positioning of the windsubject to the control of the spiralgage machine control of the Hubbard patent, In mysynethod, thepositioning of the first winding an the mandrel-is accomplished by theoperator winding the cord gage A This spiral gage obviates the possibleerrors in winding by the operator and insures that each belt is woundwith the same number of spirals and of spirals of uniform pitch. Thisinsures that when the belts are stretched to final form, they are ofuniform composition and length.

What I claim as my invention and desire to secure by Letters Patent isThe method. of manufacturing endless driving belts, comprising the stepsof providing a mandrel in the form of with a spiral gage thereon, thenwindinga single strand of cord in an open spiral around the mandrel andagainst the'spiral gage to determine the length of the cord of the firstWinding and the position of each turn of the Winding with relation tothe other turns, and continuing this winding at least twice around themandrel, the second or subsequent windings lying preferably closeagainst the next preceding winding, then joining the ends of the cordafter the number of windings have been completed, then removing themandrel from the interior of the windings, and then stretching the beltto draw the first and last of the windings against each other,substantially as described.

In testimony whereof I afiix my signature.

THOMAS SLOPER.

against the spiral split ring-

